Electric heating device



Sept. 6, 1932.

/////l//llll R. BRAUNAGEI. 1,875,844

.ELECTRIC HEATING DEV'IIGE Filed Aug. 12; 1930 2 Sheets-Sheet l l f///|/////// l 9 BY 92M /ATTORNEYS Sept. 6, 1932. R. BRAUNAGEL 1,875,844.

ELECTRIC HEATING DEVICE Filed Aug. 12, 1930 zsneets-Sneet 2 :wem-0R Rose-RT BRAUNA GEL.

BY #M v ATTORNEYS Patented Sept. 6,A 1932 ROBERT BBAUNAGEL, or VvIC'roJaIA;marmer: COLUMBIA, CANADA l ELECTRIC HEATIGDEVICE Application med August 12, 19'30. ysemi 110.474,831.

My invention relates to improvements in electric heating devices which are particularly adapted for use in electric ranges and the n like. The objects of the invention are kto provide means whereby the temperature of a hot plate will be maintained above room temperature for an extended period after switching ofIp the hot plate; to provide for surplus heat from said hot plate to be utilized for heating lo an air circulating chamber and water coils therein, and yto provide means, othery than the hot plate heating means, for maintaining said hot plate temperature and for heating y the chamber and the water coils so that vin locations where two current rates are in force,

one being relatively high for daytime current when peak conditions apply at the generating plant and the other being low for night current when it is desired by reducing the rate to induce the use of current to equalize consumption, a. decided economy of fuel may be obtained.

The invention consists essentiall of a chamber having one or more 'hot p ates in i L its top wall, andk electrically heated hot water coils therein and heat transfer means between kthe two, as will be more fully described in the following specification and shown in the accompanying drawings, 'in Which:-

Fig. 1 is a vertical sectional view of a hot plate and hot water coil unit of the invention. Fig. 2 is a sectional view of an air heating chamber containing a plurality of units.

Fig. 3 is a plan view and horizontal section L' taken on the line 3,-3 of Figure 1.

In the drawings like charactersof reference indicate corresponding parts in each figure. The numeral 1 indicates a chamber having u a removable bottom wall 2, side walls 3 and a top wall 4, ally of which are suitably insulated to conserve .heat generatedl within the chamber. rl`he chamber is preferably fitted with air inlet pipes 5 and an air outlet pipe 6, so that air heated by theunits may be trans- Jf'erred to any desired point of use. Fitted in the chamber is a plurality of heating units generally indicated by the numeral 7 which consist of a hot plate 8 having one or more l heating elements 9 therein, adapted for connection to a suitable circuit. Extending interlayersfare downwardly from the hot plate is aplurality l of copper tubes 10 which are open at their lower extremities and are provided adjacent their upper ends with insulated bushings v11.

Fitted at the upper end of each tube 10 is a block of insulating material 12 from which a copper rod 13 extendsdownwardl toa point below v'the bottom ofthe tubeV w. ere it is fitted lwith a Contact button 14. Surround- `ing eachyrod 13 and connected thereto at its connecting a circuit lead 16.

l The interior of the tubes 10 is packed with suitable insulating material 17 which is so placed as to insulate the wrappings of the resistance 'element from the rod 13. Inlet and an outlet manifolds 18 and 19 respectively surround each series of tubes connected by inlet and outlet pipes 20 and 10, which are 21V respectively to a hot water system and are connected together by vertical vtubes 22 'spirally wound around each of The lower end of the tubes 10 the tubes 10. of leach unit project downwardly finto, closelyI fitting sleeves 23 embedded inacomposite slab 24 of Ainsulating" material consisting of compressed, asbestos laminations 25 vseparated with bright sheet metal' inter-layers 26, which sleeves 23.

in intimate contact with the below'eachunit is a connector 27 comprising a block of insulating lmaterial a metallic ring 29 which suppor 28 enclosing ts a plurality of lsockets 30, vequal in number to the number of*` tubes 1.0 ina unit. These sockets each trically with each hot plate 8, fo

r the purpose of reflecting the heat generated by the element 9 and 15 back into the spac e between the circumferentially disposed tubes 10.

my invention I will now briefl function;

Having thus describedthe several partsof y explain its When using the device for cooking, a utensil is placed upon the hot plate 8 and the current to its element 9 is switched on. AS heat is generated in the hot plate some of it is conducted downwards through t-he tubes 10 in the chamber l, where it may be transmitted in part to the hot water pipes 22 and the water therein,'and to the air within the chamber. Obviously when the contents in the utensil are at a relatively low temperature,

such material will absorb the major portion of heat from the elements, and no appreciable heat will pass downwards into the tubes 10 until the contents of the utensil are materially increased in temperature also.

The heat absorbed by the tubes 10 and associated parts, if not otherwise dissipated, will remain in reserve after the elements 9 have been switched oil and will serve to maintain a. substantial heat for a lengthy period in the hot plate, so that if the hot plate is again brought .into use, a quick return to maximum heat will result therein. When the circuits which include the resistance elements are closed the heat generated therein Will heat the tubes l0 and in part be conducted to the hot plate 8 to maintain it at a moderate temperature and at the same time will impart heat to ythe water tubes 22 and the air within the chamber l for use in heating the building in which the chamber is installed.

That I claim as my invention is l. An electric heat-ing device comprising a chamber having a top wall, a hotvplate mounted in said top wall for heating utensils, a vertical tubular member integral with the hot plate, a resistance element in .the hot plate, a further resistance element in the tubular member and a hot water heating tube within the zone of heat of the tubular member.

2. An electric heating device having a top wall embodying va hot plate, a plurality of members depending concentrically from said hot plate into the chamber, each of said members being provided with a heating element separate from the hot plate, a hot water coil surrounding each element and an intake and an outlet manifold surrounding the elements and communicating with each of the coils.

3. An electric heating device comprising a chamber having an apertured top wall, a hot plate totally closing the aperture and adapted for heating a utensil placed thereon, said hot plate having metallic members extending downwardly into the chamber for conducting heat from the hot plate into the chamber to heat it.

4. An electric heating device comprising a chamber having an apertured top wall, a hot plate totally closing the aperture and adapted for heating a utensil placed thereon, said hot plate having metallic members extending downwardly into the chamber for conducting heat from the hot plate, and means surroundf July, 1930.

ROBERT BRAUNAGEL. 

